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World of Warcraft Upgrades and Item Upgrading Upgrades can boost the value of certain numeric stats on armor, weapons and rings. Upgrades also increase bonuses such as Crit chance and damage from PvE. For example, a weapon with the upgrade template that is ending in % will take on 3% attack damage every time it upgrades (relative to its previous value). Item upgrading costs crests and the current level of the item. The cost increases with item's level. Components Upgrade components can be added